21CFR177.2600橡胶

(c) Supports.Suitablesupportsforreverseosmosismembranesarematerialspermittedforsuchusebyregulationsinparts170through186ofthischapter,substancesgenerallyrecognizedassafeinfood,andsubstancesusedinaccordancewithapriorsanctionorapproval.(d) Conditionsofuse.(1)Reverseosmosismembranesdescribedinparagraphs(a)(1),(a)(2),(a)(3),and(a)(5)ofthissectionmaybeusedincontactwithalltypesofliquidfoodattemperaturesupto80C(176F).(2) Reverseosmosismembranesdescribedinparagraph(a)(4)ofthissectionmaybeusedincontactwithalltypesofliquidfood,exceptfoodcontainingmorethan8percentalcohol,attemperaturesupto80C(176F).(3) Reverseosmosismembranesshallbemaintainedinasanitarymannerinaccordancewithcurrentgoodmanufacturingpracticesoastopreventmicrobialadulterationoffood.(4) Toassuretheirsafeuse,reverseosmosismembranesandtheirsupportsshallbethoroughlycleanedpriortotheirfirstuseinaccordancewithcurrentgoodmanufacturingpractice.49FR49448,Dec.20,1984,asamendedat52FR29668,Aug.11,1987;53FR31835,Aug.22,1988;53FR32215,Aug.24,1988;55FR8139,Mar.7,1990;59FR9925,Mar.2,1994177.2600Rubberarticlesintendedforrepeateduse.Rubberarticlesintendedforrepeatedusemaybesafelyusedinproducing,manufacturing,packing,processing,preparing,treating,packaging,transporting,orholdingfood,subjecttotheprovisionsofthissection.(a) Therubberarticlesarepreparedfromnaturaland/orsyntheticpolymersandadjuvantsubstancesasdescribedinparagraph(c)ofthissection.(b) Thequantityofanysubstanceemployedintheproductionofrubberarticlesintendedforrepeateduseshallnotexceedtheamountreasonablyrequiredtoaccomplishtheintendedeffectintherubberarticleandshallnotbeintendedtoaccomplishanyeffectinfood.(c) Substancesemployedinthepreparationofrubberarticlesincludethefollowing,subjecttoanylimitationsprescribed:(1) Substancesgenerallyrecognizedassafeforuseinfoodorfoodpackaging.(2) Substancesusedinaccordancewiththeprovisionsofapriorsanctionorapproval.(3) Substancesthatbyregulationinparts170through189ofthischaptermaybesafelyusedinrubberarticles,subjecttotheprovisionsofsuchregulation.(4) Substancesidentifiedinthisparagraph(c)(4),providedthatanysubstancethatisthesubjectofaregulationinparts174,175,176,177,178and179.45ofthischapterconformswithanyspecificationinsuchregulation.(i) Elastomers.Acrylonitrile-butadienecopolymer.Brominatedisobutylene-isoprenecopolymerscomplyingwith177.1210.Butadiene-acrylonitrile-ethyleneglycoldimethacrylatecopolymerscontainingnotmorethan5weightpercentofpolymerunitsderivedfromethyleneglycoldimethacrylate.Butadiene-acrylonitrile-methacrylicacidcopolymer.Butadiene-styrene-methacrylicacidcopolymer.Chloroprenepolymers.Chlorotrifluoroethylene-vinylidenefluoridecopolymer.thylene-propylenecopolymerelastomerswhichmaycontainnotmorethan5weight-percentoftotalpolymerunitsderivedfrom5-methylene-2-norborneneand/or5-ethylidine-2-norbornene.Ethylene-propylene-dicyclopentadienecopolymer.Ethylene-propylene-1,4-hexadienecopolymerscontainingnomorethan8weightpercentoftotalpolymerunitsderivedfrom1,4-hexadiene.Hydrogenatedbutadiene/acrylonitrilecopolymers(CASReg.No.88254-10-8)producedwhenacrylonitrile/butadienecopolymersaremodifiedbyhydrogenationoftheolefinicunsaturationtoleaveeither:(1)Notmorethan10percenttransolefinicunsaturationandnoa,b-olefinicunsaturationasdeterminedbyamethodentitledDeterminationofResiduala,b-OlefinicandTransOlefinicUnsaturationLevelsinHNBR,developedOctober1,1991,byPolysarRubberCorp.,1256SouthVidalSt.,Sarnia,Ontario,CanadaN7T7MI;or(2)0.4percentto20percentolefinicunsaturationandMooneyviscositiesgreaterthan45(ML1+4100C),asdeterminedbyASTMStandardMethodD1646-92,StandardTestMethodforRubberViscosityandVulcanizationCharacteristics(MooneyViscometer),whicharebothincorporatedbyreferenceinaccordancewith5U.S.C.552(a)and1CFRpart51.CopiesofthesemethodsmaybeobtainedfromtheDivisionofPetitionControl(HFS215),CenterforFoodSafetyandAppliedNutrition,FoodandDrugAdministration,5100PaintBranchPkwy.,CollegePark,MD20740,ormaybeexaminedattheCenterforFoodSafetyandAppliedNutritionsLibrary,200CSt.SW.,Washington,DC,orattheOfficeoftheFederalRegister,800NorthCapitolSt.NW.,suite700,Washington,DC.AcopyofASTMStandardMethodD164692mayalsobeobtainedfromtheAmericanSocietyforTestingandMaterials,100BarrHarborDr.,WestConshohocken,PA194282959.Isobutylene-isoprenecopolymer.Polyamide/polyetherblockcopolymers(CASReg.No.77402381preparedbyreactingacopolymerofomega-laurolactamandadipicacidwithpoly(tetramethyleneetherglycol).Thepolyamideandpolyethercomponentsarereactedinratiossuchthatthepolyamidecomponentconstitutesaminimumof30weight-percentoftotalpolymerunits.ThecopolymersmaybeusedincontactwithfoodsofTypesI,II,III,IV,V,VI,VII,VIII,andIXidentifiedintable1of176.170(c)ofthischapterattemperaturesnottoexceed150Fexceptthatthosecopolymerspreparedwithlessthan50weight-percentofpolyamidearelimitedtouseincontactwithsuchfoodsattemperaturesnottoexceed100F.Polybutadiene.Polyesterelastomersderivedfromthereactionofdimethylterephthalate,1,4-butanediol,anda-hydro-omega-hydroxypoly(oxytetramethylene).Additionally,trimethyltrimellitatemaybeusedasareactant.Thepolyesterelastomersmaybeusedonlyincontactwithfoodscontainingnotmorethan8percentalcoholandlimitedtouseincontactwithfoodattemperaturesnotexceeding150F.Polyisoprene.Polyurethaneresins(CASReg.Nos.37383281or901804-6)derivedfromthereactionofdiphenylmethanediisocyanatewith1,4-butanediolandpolytetramethyleneetherglycol.Polyurethaneresinsderivedfromreactionsofdiphenylmethanediisocyanatewithadipicacidand1,4-butanediol.Rubber,natural.SiliconebasicpolymerasdescribedinASTMmethodD1418-81,StandardPracticeforRubberandRubberLaticesNomenclature,whichisincorporatedbyreference.CopiesmaybeobtainedfromtheAmericanSocietyforTestingMaterials,1916RaceSt.,Philadelphia,PA19103,ormaybeexaminedattheOfficeoftheFederalRegister,800NorthCapitolStreet,NW.,suite700,Washington,DC20408.Silicone(Si)elastomerscontainingmethylgroups.Silicone(Psi)elastomerscontainingmethylandphenylgroups.Silicone(Vsi)elastomerscontainingmethylandvinylgroups.Silicone(Fsi)elastomerscontainingmethylandfluorinegroups.Silicone(PVsi)elastomerscontainingphenyl,methyl,andvinylgroups.Styrene-butadienecopolymer.Vinylidenefluoride-hexafluoropropylenecopolymers(minimumnumberaveragemolecularweight70,000asdeterminedbyosmoticpressureinmethylethylketone).Vinylidenefluoride-hexafluoropropylene-tetrafluoroethylenecopolymers(minimumnumberaveragemolecularweight100,000asdeterminedbyosmoticpressureinmethylethylketone).(ii) Vulcanizationmaterials(a)Vulcanizingagents.4,4-Bis(aminocyclohexyl)methanecarbamateforuseonlyascross-linkingagentinthevulcanizationofvinylidenefluoridehexafluoropropylenecopolymerandvinylidenefluoride-hexafluoropropylene-tetrafluoroethylenecopolymerelastomersidentifiedunderparagraph(c)(4)(i)ofthissectionandlimitedtouseatlevelsnottoexceed2.4percentbyweightofsuchcopolymers.Diisopropylxanthogenpolysulfide(a1:2:1mixtureofO,O-di(1-methylethyl)trithio-bis-thioformate,O,O-di(1-methylethyl)tetrathio-bis-thioformate,andO,O-di(1-methylethyl)pentathio-bis-thioformate)foruseasacrosslinkingagentinthevulcanizationofnaturalrubber,styrene-butadienecopolymer,acrylo-nitrile-butadienecopolymer,andethylenepropyleneterpolymersidentifiedunderparagraph(c)(4)(i)ofthissectionandlimitedtouseatlevelsnottoexceed2.4percentbyweightofsuchcopolymers.Hexamethylenediaminecarbamateforuseonlyascross-linkingagentinthevulcanizationofvinylidenefluoridehexafluoropropylenecopolymerandvinylidenefluoride-hexafluoropropylene-tetra-fluoroethylenecopolymerelastomersidentifiedunderparagraph(c)(4)(i)ofthissectionandlimitedtouseatlevelsnottoexceed1.5percentbyweightofsuchcopolymers.Sulfur,ground.(b) Accelerators(totalnottoexceed1.5percentbyweightofrubberproduct).2-Benzothiazyl-N,N-diethylthiocarbamyl-sul-fide.Benzoylperoxide.1,3- Bis(2-benzothiazolylmercaptomethyl)urea.N-tert-Butyl-2-benzothiazolesulfenamide.Butyraldehyde-anilineresin(iodinenumber670-705).Carbondisulfide-1,1-methylenedipiperidinereactionproduct.Copperdimethyldithiocarbamate.N-Cyclohexyl-2-benzothiazolesulfenamide.Dibenzoyl-p-quinonedioxime.Dibenzylamine.Diisopropylxanthogenpolysulfide(a1:2:1mixtureofO,O-di(1-methylethyl)trithio-bis-thioformate,O,O-di(1-methylethyl)tetrathio-bis-thioformate,andO,O-di(1-methylethyl)pentathio-bis-thioformate).Di(4-methylbenzoyl)peroxide(CASReg.No.895-85-2)foruseonlyasacrosslinkingagentinsiliconepolymersandelastomersidentifiedunderparagraph(c)(4)(i)ofthissectionatlevelsnottoexceed1percentbyweightofsuchpolymersandelastomerswherethetotalofallacceleratorsdoesnotexceed1.5percentbyweightofrubberproduct.Di-tert-butylperoxide.Dibutylxanthogendisulfide.2,4- Dichlorobenzoylperoxide.Dicumylperoxide.N,N-Dimethylcyclohexylaminesaltofdibutyldithiocarbamicacid.2,6-Dimethylmorpholinethiobenzothiazol.Dipentamethylenethiuramhexasulfide(CASReg.No.971-15-3).Diphenylguanidine.Diphenylguanidinephthalate.1,3-Diphenyl-2-thiourea.2,2-Dithiobisbenzothiazole.4,4-Dithiodimorpholine.N,N-Di-o-tolylguanidine.Di-o-tolylguanidinesaltofpyrocatecholborate.Ethylenediaminecarbamate.Heptaldehyde-anilineresin(iodinenumber430-445).Hexamethylenetetramine.2-Mercaptobenzothiazole.2-Mercaptothiazoline.N-Oxydiethylene-benzothiazole-2-sulfenamide.Piperidiniumpentamethylenedithiocarbamate.Potassiumpentamethylenedithiocarbamate.p-Quinonedioxime.Sodiumdibutyldithiocarbamate.Sodiumdimethyldithiocarbamate.Stannousoleateforuseonlyasanacceleratorforsiliconeelastomers.Tetrabutylthiurammonosulfide.Tetraethylthiuramdisulfide.(1,1,4,4-Tetramethyltetramethylene)bistertbutylperoxide.Tetramethylthiurammonosulfide.Thiram(tetramethylthiuramdisulfide).Triallylcyanurate.Triethylenetetramine.1,3,5-Triethyl-hexahydro-s-triazine(triethyltrimethylenetriamine).Triphenylguanidine.Zincbutylxanathate.Zincdibenzyldithiocarbamate.Zincdibutyldithiocarbamate.Zincdiethyldithiocarbamate.Zinc2-mercaptobenzothiazole.Ziram(zincdimethyldithiocarbamate).(c) Retarders(totalnottoexceed10percentofweightofrubberproduct).Cyanoguanidine.Phthalicanhydride.Salicylicacid.(d) Activators(totalnottoexceed5percentbyweightofrubberproductexceptmagnesiumoxidemaybeusedathigherlevels).Diethylamine.Fattyacidamines,mixed.Fattyacids.Magnesiumcarbonate.Magnesiumoxide,lightandheavy.Oleicacid,dibutylaminesalt(dibutylammoniumoleate).Stannouschloride.Talloilfattyacids.Tetrachloro-p-benzoquinone.Triethanolamine.Zincsaltsoffattyacids.(iii) Antioxidantsandantiozonants(totalnottoexceed5percentbyweightofrubberproduct).Aldol-a-naphthylamine.Alkylated(C4and/orC8)phenols.BHT(butylatedhydroxytoluene).4-4,6-bis(octylthio)-s-triazin-2-ylamino-2,6-di-tert-butylphenol(CASReg.No.991-84-4)foruseonlyasastabilizeratlevelsnottoexceed0.5percentbyweightofthefinishedrubberproduct.Butylatedreactionproductofp-cresolanddicyclopentadieneasidentifiedin178.2010(b)ofthischapter.Butylated,styrenatedcresolsidentifiedin178.2010(b)ofthischapter.4,4-Butylidinebis(6-tert-butyl-m-cresol).N-Cyclohexyl-N-phenylphenylenediamine.p,p-Diaminodiphenylmethane.2.5- Di-tert-amylhydroquinone.Diaryl-p-phenylenediamine,wherethearylgroupmaybephenyl,tolyl,orxylyl.2.6- Di-tert-butyl-p-phenylphenol.1,2- Dihydro-2,2,4-trimethyl-6-dodecylquinoline.1,2- Dihydro-2,2,4-trimethyl-6-ethoxyquinoline.1,2- Dihydro-2,2,4-trimethyl-6-phenylquinoline.4,4-Dimethoxydiphenylamine.4.6- Dinonyl-o-cresol.N,N-Dioctyl-p-phenylenediamine.Diphenylamine-acetoneresin.Diphenylamine-acetone-formaldehyderesin.N,N-Diphenylethylenediamine.N,M-Disalicylalpropylenediamine.N,M-Di-o-tolylethylenediamine.Hydroquinonemonobenzylether.Isopropoxydiphenylamine.N-Isopropyl-N-phenyl-Q-phenylenediamine.2,2-Methylenebis(6-兌M-butyl-4-ethylphenol).2,2-Methylenebis(4-methyl-6-兌M-butyl-phenol).2,2-Methylenebis(4-methyl-6-nonylphenol).2,2-Methylenebis(4-methyl-6-兌M-octylphenol).Monooctyl-anddioctyldiphenylamine.N,Nz-Di-b-naphthyl-Q-phenylenediamine.Phenyl-a-naphthylamine.Phenyl-b-naphthylamine.Phenyl-b-naphthylamine-acetonearomaticamineresin(averagemolecularweight600;nitrogencontent5.3percent).o-andQ-Phenylphenol.Polybutylated(mixture)4,4-isopropylidenediphenol.Sodiumpentachlorophenate.Styrenatedcresolsproducedwhen2molesofstyrenearemadetoreactwith1moleofamixtureofphenolando-,m-,andQ-cresolssothatthefinalproducthasaBrookfieldviscosityat25Cof1400to1700centipoises.Styrenatedphenol.4,4-Thiobis(6-tert-butyl-m-cresol).Toluene-2,4-diamine.N-o-Tolyl-N-phenyl-Q-phenylenediamine.Q(Q-Tolylsufanilamide)diphenylamine.Tri(mixedmono-anddinonylphenyl)phosphite.Tri(nonylphenyl)phosphite-formaldehyderesinsproducedwhen1moleoftri(nonylphenyl)phosphiteismadetoreactwith1.4molesofformaldehydeorproducedwhen1moleofnonylphenolismadetoreactwith0.36moleofformaldehydeandthereactionproductisthenfurtherreactedwith0.33moleofphosphorustrichloride.Thefinishedresinshaveaminimumviscosityof20,000centipoisesat25C,asdeterminedbyLV-seriesBrookfieldviscometer(orequivalent)usingaNo.4spindleat12r.p.m.,andhaveanorganicphosphoruscontentof4.05to4.15percentbyweight.(iv) Plasticizers(totalnottoexceed30QercentbyweightofrubberQroductunlessotherwisesQecified).n-Amyln-decylphthalate.Butylacetylricinoleate.n-Butylesteroftalloilfattyacids.Butyllaurate.Butyloleate.Butylstearate.Calciumstearate.Castoroil.Coumarone-indeneresins.2,2-Dibenzamidodiphenyldisulfide.Dibenzyladipate.Dibutoxyethoxyethyladipate.Dibutylphthalate.Dibutylsebacate.Didecyladipate.Didecylphthalate.Diisodecyladipate.Diisodecylphthalate.Diisooctyladipate.Diisooctylsebacate.Dioctyladipate.Dioctylphthalate.Dioctylsebacate.Dipenteneresin.Diphenylketone.Fattyacids.Fattyacids,hydrogenated.Isooctylesteroftalloilfattyacids.Lanolin.a-Methylstyrene-vinyltoluenecopolymerresins(molarratio1a-methylstyreneto3vinyltoluene).Mineraloil;(1)Inrubberarticlescomplyingwiththissection,nottoexceed30percentbyweight;(2)Aloneorincombinationwithwaxes,petroleum,totalnottoexceed45percentbyweightofrubberarticlesthatcontainatleast20percentbyweightofethylene-propylenecopolymerelastomercomplyingwithparagraph(c)(4)(i)ofthissection,incontactwithfoodsofTypesI,II,III,IV,VI,VII,VIII,andIXidenifiedintable1of176.170(c)ofthischapter.Montanwax.n-Octyln-decyladipate.n-Octyln-decylphthalate.Petrolatum.Petroleumhydrocarbonresin(cyclopentadienetype),hydrogenated.Petroleumhydrocarbonresin(producedbythehomo-andcopolymerizationofdienesandolefinsofthealiphatic,alicyclic,andmonobenzenoidarylalkenetypesfromdistillatesofcrackedpetroleumstocks).Petroleumhydrocarbonresin(producedbythecatalyticpolymerizationandsubsequenthydrogenationofstyrene,vinyltoluene,andindenetypesfromdistillatesofcrackedpetroleumstocks).Petroleumoil,sulfonated.Phenol-formaldehyderesin.Pinetar.Polybutene.Polystyrene.Propyleneglycol.n-Propylesteroftalloilfattyacids.Rapeseedoilvulcanizedwithrubbermakerssulfur.Rosinsandrosinderivativesidentifiedin175.105(c)(5)ofthischapter.Soybeanoilvulcanizedwithrubbermakerssulfur.Styrene-acrylonitrilecopolymer.Terpeneresins.Triethyleneglycoldicaprate.Triethyleneglycoldicaprylate.Waxes,petroleum.Xylene(ortoluene)alkylatedwithdicyclopentadiene.Zinc2-benzamidothiophenate.(v) Fillers.Aluminumhydroxide.Aluminumsilicate.Asbestosfiber,chrysotileorcrocidolite.Bariumsulfate.Carbonblack(channelprocessorfurnacecombustionprocess;totalcarbonblacknottoexceed50percentbyweightofrubberproduct;furnacecombustionblackcontentnottoexceed10percentbyweightofrubberproductsintendedforuseincontactwithmilkoredibleoils).Cork.Cotton(floc,fibers,fabric).Mica.Nylon(floc,fibers,fabric).Silica.Titaniumdioxide.Zinccarbonate.Zincsulfide.(vi) Colorants.Colorantsusedinaccordancewith178.3297ofthischapter.(vii) Lubricants(totalnottoexceed2percentbyweightofrubberproduct).Polyethylene.Sodiumstearate.(viii)Emulsifiers.Fattyacidsalts,sodiumorpotassium.Naphthalenesulfonicacid-formaldehydecondensate,sodiumsalt.Rosinsandrosin-derivativesidentifiedin175.105(c)(5)ofthischapter.SodiumdecylbenzenesulfonateSodiumdodecylbenzenesulfonateSodiumlaurylsulfate.Talloilmixedsoap(calcium,potassium,andsodium).(ix)Miscellaneous(totalnottoexceed5percentbyweightofrubberproduct).Animalglueasdescribedin178.3120ofthischapter.Azodicarbonamideaschemicalblowingagent.2-Anthraquinonesulfonicacidsodiumsaltforuseonlyaspolymerizationinhibitorinchloroprenepolymersandnottoexceed0.03percentbyweightofthechloroprenepolymers.1,2- Benzisothiazolin-3-one(CASReg.No.2634335)foruseasabiocideinuncuredliquidrubberlatexnottoexceed0.02percentbyweightofthelatexsolids,wherethetotalofallitemslistedinparagraph(c)(4)(ix)ofthissectiondoesnotexceed5percentoftherubberproduct.n-Butyllithiumforuseonlyaspolymerizationcatalystforpolybutadiene.4-tert-Butyl-o-thiocresolaspeptizingagent.tert-Butylperacetate.p-tert-Butylpyrocatechol.Dialkyl(C8C18Di-andtriethanolamine.Diethylxanthogendisulfide.4-(Diiodomethylsulfonyl)toluene,ChemicalAbstractsServiceRegistryNo.20018-09-01,foruseasanantifungalpreservativeatlevelsnottoexceed0.3percentbyweightofthesealantsandcaulkingmaterials.Dodecylmercaptanisomers,singleormixed.2-Ethoxyethanol.Iodoform.p-Menthanehydroperoxide.a-(p-Nonylphenyl)-omega-hydroxypoly(oxyethylene)mixtureofdihydrogenphosphateandmonohydrogenphosphateesters,bariumsalt;thenonylgroupisapropylenetrimerisomerandthepoly(oxyethylene)contentaverages9moles;foruseonlyasresidualpolymerizationemulsifieratlevelsnottoexceed0.7percentbyweightofethylene-propylene-1,4-hexadienecopolymersidentifiedunderparagraph(c)(4)(i)ofthissection.4,4-Oxybis(benzenesulfonhydrazide)aschemicalblowingagent.Phenothiazine.Potassiumpersulfate.Sodiumformaldehydesulfoxylate.Sodiumpolysulfide.Sodiumnitrite.Sodiumsaltofethylenediaminetetraaceticacidandglycine.Sodiumsulfide.Styrenemonomer.Talloil.Thioxylenoisaspeptizingagents.Tridecylmercaptan.Zinc4-tert-butylthiophenateaspeptizingagent.(d) Rubberarticlesintendedforusewithdryfoodaresoformulatedandcuredunderconditionsofgoodmanufacturingpracticeastobesuitableforrepeateduse.(e) Rubberarticlesintendedforrepeateduseincontactwithaqueousfoodshallmeetthefollowingspecifications:Thefood-contactsurfaceoftherubberarticleinthefinishedforminwhichitistocontactfood,whenextractedwithdistilledwateratrefluxtemperature,shallyieldtotalextractivesnottoexceed20milligramspersquareinchduringthefirst7hoursofextraction,nortoexceed1milligrampersquareinchduringthesucceeding2hoursofextraction.(f) Rubberarticlesintendedforrepeateduseincontactwithfattyfoodsshallmeetthefollowingspecifications:Thefood-contactsurfaceoftherubberarticleinthefinishedforminwhichitistocontactfood,whenextractedwithn-hexaneatrefluxtemperature,shallyieldtotalextractivesnottoexceed337177.271021CFRCh.I(4-1-02Edition)175milligramspersquareinchduringthefirst7hoursofextraction,nortoexceed4milligramspersquareinchduringthesucceeding2hoursofextraction.(g) Inaccordancewithgoodmanufacturingpracticefinishedrubberarticlesintendedforrepeateduseincontactwithfoodshallbethoroughlycleansedpriortotheirfirstuseincontactwithfood.(h) Theprovisionsofthissectionarenotapplicabletorubbernursing-bottlenipples.(i) Acrylonitrilecopolymersidentifiedinthissectionshallcomplywiththeprovisionsof180.22ofthischapter.42FR14572,Mar.15,1977EDITORIALNOTE:ForFEDERALREGISTERcitationsaffecting177.2600,seetheListofCFRSectionsAffected,whichappearsintheFindingAidssectionoftheprintedvolumeandonGPOAccess.177.2710Styrene-divinylbenzeneresins,cross-linked.Styrene-divinylbenzenecross-linkedcopolymerresinsmaybesafelyusedasarticlesorcomponentsofarticlesintendedforrepeateduseinproducing,manufacturing,packing,processing,preparing,treating,packaging,transporting,orholdingfood,inaccordancewiththefollowingprescribedconditions:(a) Theresinsareproducedbythecopolymerizationofstyrenewithdivinylbenzene.(b) Theresinsmeettheextractiveslimitationsprescribedinthisparagraph:(1)Theresinstobetestedaregroundorcutintosmallparticlesthatw